zuul 自定义filter 修改请求参数

大老板 8月前 ⋅ 486 阅读

需求

原始请求体body

{
   "uri":"/xxx",
   "a":"xxx",
   "b":"xxx"
}

路由转发到服务A的 /xxx接口 请求参数body

{
   "c":"yyy",
   "d":"xxx"
}

实现

新建一个pre filter,将参数 a、 b 转换成 c 、d

@Override
public Object run() throws ZuulException {
    RequestContext requestContext = RequestContext.getCurrentContext();
    ....
    //传递uri
    requestContext.addZuulRequestHeader("uri", "/xxx");
    //修改请求body
    byte[] reqBodyBytes = "转换后的body json字符串".getBytes(StandardCharsets.UTF_8);
    requestContext.setRequest(new HttpServletRequestWrapper(request){
        @Override
        public ServletInputStream getInputStream() throws IOException {
            return new ServletInputStreamWrapper(reqBodyBytes);
        }

        @Override
        public int getContentLength() {
            return reqBodyBytes.length;
        }

        @Override
        public long getContentLengthLong() {
            return reqBodyBytes.length;
        }
    });
    ....

再新建一个 route filter 转发请求到服务A

@Override
public Object run() {
    RequestContext context = RequestContext.getCurrentContext();
    ...
    RibbonCommandContext commandContext = buildCommandContext(context);
    RibbonCommandContext realCommandContext = new RibbonCommandContext(commandContext.getServiceId(),
            commandContext.getMethod(), context.getZuulRequestHeaders().get("uri"),
            commandContext.getRetryable(), commandContext.getHeaders(), commandContext.getParams(),
            commandContext.getRequestEntity(), commandContext.getRequestCustomizers(),
            commandContext.getContentLength(), commandContext.getLoadBalancerKey());
    RibbonCommand command = this.ribbonCommandFactory.create(realCommandContext);
    ClientHttpResponse response = command.execute();
    ...
}

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